You see error code C00D124D when you're using the Zune software with your computer and a connected device, such as a Windows Phone 7 or a Zune player.
This may mean that your computer doesn't recognize the connected device.
To resolve this problem, try the following solutions.
Solution 1: Disconnect the device and then restart. Disconnect the device from your computer, and then restart your device and your computer.
Press and hold the Power button until you see “Slide down to power off,” and then flick down. After it's off, press the Power button to turn on your phone again.
If this restart sequence doesn't work for your phone, try the following options:
Press and hold the power button for about 10 seconds until the player restarts.
Note To make sure that the Hold switch is in the unlocked position, you may have to move the switch back and forth until the switch is in the correct position.
Reconnect your device to the computer using the USB cable that came with your device, and then try syncing your media again.
To see if your items synced, go to the Phone or Device screen. Then, click Summary or the device icon to confirm that the items were added.
Solution 2: Try the "Computer doesn't recognize your device on the Zune software” solution. To try a step-by-step solution, go to Computer doesn't recognize your device on the Zune software .
Solution 3: Reinstall the Zune software. To do this, see Download or reinstall the Zune Music + Video software and Zune player software.
Solution 4: Update the device driver for your Windows Phone 7. Connect your device to your computer using the USB cord that came with the device, and then follow these steps on your computer:
If you're using Windows 8: From the Start screen, start typing “computer.” When it appears on your screen, right-click or swipe the Computer icon, and then click or tap Properties.
If these solutions don't resolve the problem, contact Xbox Support.
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